Wide Selection — available in a wide variety of body materials, linings and end connections. By utilizing such highly resistant linings as Saran, Polypropylene, Kynar, Tefzel, Glass, Rubber, etc., virtually any chemical service within the pressure/temperature limits of the valve can be handled safely and economically.

No Stem Leakage — since the diaphragm isolates the fluid stream there is no need for a packing gland — no atmospheric contamination, no leakage or waste, no expensive maintenance of stem, seats or stuffing box.

Bubble-Tight Shut Off — results when the downward thrust of the stem and compressor assembly molds the flexible diaphragm against the weir. The diaphragm will accommodate itself to rust, scale, slurry, or fibrous material.

Streamline Flow — with minimum pressure drop because of the absence of grooves, pockets or sharp changes in direction of flow.

Cost Saving — simple in-line maintenance. In less time than it takes to remove and replace a conventional valve, a new body diaphragm can be installed. Thus providing essentially a brand new valve at a tiny faction of the cost of a new or repaired conventional valve — all without removing the valve body from the line.

Flow Control — the automated diaphragm valve provides an excellent means of handling the changing flow requirements in most process installations. By the addition of a positioner to the actuator, even more precise control can be achieved, especially in the handling of slurries, or viscous and fibrous materials.

Valve Size [Decimal]

Diaphragm Control Valve Options

Line Pressure Conditions1

Weight

0% P.D. means that downstream pressure remains at, or returns to essentially the same as the upstream pressure.

Diaphragm Selection

Diaphragm Material

2 Piece PTFE/EPDM

Diaphragm Material Description

TFE PTFE - over the years, a broad range of elastomeric and plastic diaphragms have been developed which will successfully handle all aggressive fluids, gases and slurries, as well as food, beverage and pharmaceutical products where F.D.A. approval of materials of construction is required. The TFE faced diaphragm is backed with fabric reinforced elastomer to provide the high chemical and temperature resistant qualities of TFE with flexibility for longer life and tighter shut-off.

Action of Actuator1

1 The choice of actuator size is determined by the line pressure through the value and the available operating air pressure. Some operating conditions call for substantial line pressure downstream when the valve closes.

After the valve closes, if the downstream pressure is less that 30 % of the upstream pressure - this condition is 100% Δ P. If the downstream pressure is 30% or more of the upstream pressure - the condition is 0% Δ P.